As mentioned in the article, this has been an automated feature since iOS 8: https://support.apple.com/en-us/HT210512

Looking at my battery history, the automated version has my phone sit at 80% all night, and leaves it at 100% for only a couple hours in the morning. I suspect this will be a fairly negligible impact on battery longevity for me, and most users, without the severe inconvenience of a 20% reduction in battery life.

It would be nice to know how the longevity math works out.

Unfortunately, it's not possible to reliably automate this. A phone has no way to tell how it will be used after getting charged. It can try to detect some usage patterns, but it'll just be guessing, so even in the best case scenario it must remain conservative.

This is one of my pet peeves - obvious and easy to implement features that are just not there. I literally only switched to iPhones because the blindingly obvious Emergency Bypass feature [1] wasn't available on Android.

Phones already perk up when connected to a power source. Why not display an optional dialog with a choice of either the desired max battery level and/or some user-friendly modes like "battery health" vs "battery charge"?! Easy to implement, zero downsides, massive upsides, nobody's doing it.

[1]: https://support.apple.com/en-gb/guide/iphone/iph21d43af5b/io....

Another example that this feature doesn't work is charging at car. In other words, it may work only while sleeping at night. It's far better than nothing, but I wish the 80% limit feature is available for my 13 mini.

But apparently they don't care about future sales from iPhone 15s wearing out?

Do you have anything other than context clues to go by when making this assertion?

These discussions are always baseless.

Could Apple have enabled this feature for all phones? Maybe

Would it have provided any use to older phones? Maybe

How much lifespan does it actually add? No one knows

Did they do this as planned obsolescence? Maybe.

There we go, the whole discussion finished.

My X (bought new phone in December when it was released) was at 85+% on the battery.

I replace it with a 15 because it was dropping off the OS bandwagon, needed more storage, battery life, lightning port getting fiddly.

The OS support was the stake in the heart. If not for that I would have looked into getting the phone serviced with a new battery and port, and cleaned up some storage.

I’m still getting OS updates on my X

iOS 17 does not run on the X.

That sucks. The keyboard improvements in iOS 17 make it finally usable.

Perhaps they didn't implement this in their BCM, maybe they were so caught up in the cleverness of "optimized" charging they thought it would solve the problem once and for all.

Unlikely? Yes, however it's not impossible.... and not the only alternate explanation :-)

Something seems off: my 13pro stops charging at 80% on purpose though i am not sure if that is a result of some combination of settings.

If its plugged in long enough, iPads and Macs will let it drop to 80% ... but you can't set that limit initially.

My iPhone 12 Mini sadly has never charged to 80% with that setting enabled... I suspect my usage patterns are too irregular as it is my secondary device and mostly lives on its charger.